diff --git a/.github/workflows/Fortran.yml b/.github/workflows/Fortran.yml
index 4229b097a..d85227aa4 100644
--- a/.github/workflows/Fortran.yml
+++ b/.github/workflows/Fortran.yml
@@ -2,7 +2,7 @@ name: Grid and Mesh Solver
 on: [push]
 
 env:
-  PETSC_VERSION: '3.18.2'
+  PETSC_VERSION: '3.18.4'
   HOMEBREW_NO_ANALYTICS: 'ON'     # Make Homebrew installation a little quicker
   HOMEBREW_NO_AUTO_UPDATE: 'ON'
   HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK: 'ON'
@@ -129,7 +129,7 @@ jobs:
       - name: PETSc - Prepare
         run: |
           tar -xf download/petsc-${PETSC_VERSION}.tar.gz -C .
-          sed -i "1718s/if not os.path.isfile(os.path.join(self.packageDir,'configure')):/if True:/g" \
+          sed -i "1719s/if not os.path.isfile(os.path.join(self.packageDir,'configure')):/if True:/g" \
           ./petsc-${PETSC_VERSION}/config/BuildSystem/config/package.py
           export PETSC_DIR=${PWD}/petsc-${PETSC_VERSION}
           export PETSC_ARCH=intel-${INTEL_V}